The optimal operation conditions for an all-optical feedback loop system were experimentally investigated in [1]}. The effects of detuning of the frequency between an injection laser and the reservoir laser as well as the locking of the laser state were studied for a chaotic time series prediction task. Moreover, very recently a system with two optical feedback loops was studied numerically for a time series prediction task with an information processing rate of 1 GB/s [2]}. Performance was improved over a single loop configuration owing to the rich dynamics.
